How do we know faith in God is true?

Faith in God is true when it leads individuals to trust fully in His ability to save and maintain their salvation. Romans 4:21 describes Abraham's unwavering belief that what God had promised, He was also able to perform. This reliance on God's sovereignty and capability is foundational to genuine faith. Moreover, such faith recognizes human inability and relies completely on God's faithfulness and power. It is through the preaching of the gospel that this faith is cultivated in the hearts of believers, affirming God's trustworthiness.